I've chosen to go with the same type of cleats with all my bikes. A couple of different brands/styles of pedals, but all SPD compatible.

Aesthetics? If someone else has a problem with my bike build, they can deal with it. I also have shifters that are about 10 years newer than the frame. I now have single sided SPD pedals on one bike, but I'm not sure if I really like them. Still experimenting.

I did get to the point where a couple of pairs of cycling shoes seemed appropriate. So I now have "summer shoes" and "winter shoes". Also "summer and winter" bikes.

You may eventually deem that different types of cycling shoes may have benefits for different situations.